Monolithic Power Systems, Inc. · NASDAQ:MPWR
Monolithic Power Systems — Technical Presentation (February 2024)
21 slides from Monolithic Power Systems's technical presentation, Feb 21, 2024
Slide 1: Class-D Audio with Post-Filter Feedback Using MPS Axign Technology
Class-D Audio with Post-Filter Feedback Using MPS Axign Technology February 2024 Start Time: February 21, 2024 | 8:00 AM PST | 11:00 AM EST | 5:00 PM CET | 12:00 PM CST | 7:00 PM EAT rev 20180504
Slide 2: Table of Contents
Table of Contents • Introduction • Post-Filter Feedback in Class-D Audio • Fully Digital Feedback Loop Design • High-Efficiency Audio Amplification • Audio Quality • Summary & Conclusion
Slide 3: Introduction
Introduction • Axign is a fabless semiconductor company based in the Netherlands • Founded in 2014 • Two locations in NL: • Enschede (HQ) • Nijmegen • Long relationship between Axign and MPS due to complementary IP “Axign is excited to announce that we are now a part of Monolithic • Axign acquired b
Slide 4: Post-Filter Feedback in Class-D Audio
Post-Filter Feedback in Class-D Audio • What is class-D audio? • Switching audio amplifier • Modulator creates PWM/PDM • What is post-filter feedback (PFF) in Class-D audio? • PFF implies taking the feedback point after the output filter • Feedback suppresses noise and distortion in the forward path
Slide 5: Fully Digital Feedback Loop Design
Fully Digital Feedback Loop Design • In the analog domain, parameter spread will present a limitation • High-order feedback loop designs will have smaller margins of stability • Digital feedback loops are consistent and programmable • Digital coefficients are loaded on start-up • Programmable feedba
Slide 6: Fully Digital Feedback Loop - Products
Fully Digital Feedback Loop - Products • 2-CH and 4-CH controllers for post-filter feedback available now • Power-stages and DC-DC available from MPS • AX5688 and AX5689 are power-stage agnostic • More MPS Axign products are in development
Slide 7: High-Efficiency Audio Amplification
High-Efficiency Audio Amplification
Slide 8: High-Efficiency Audio Amplification
High-Efficiency Audio Amplification • Class-D is traditionally popular due to its high efficiency • Typical audio content contains very low average power • Losses at normal listening levels are largely determined by: • Switching losses • Ripple losses • Switching losses largely occur due to the (par
Slide 9: High-Efficiency Audio Amplification
High-Efficiency Audio Amplification • Fix both switching losses and ripple losses with one solution: • Zero common-mode (ZCM) switching • Only one side switches, reducing switching losses drastically • Eliminates ripple currents for very small signals BD Modulation ZCM Modulation
Slide 10: High-Efficiency Audio Amplification
High-Efficiency Audio Amplification • Traditionally causes significant (crossover) distortion • Distortion in the audio band is eliminated by high loop gain • THD+N well below 0.005% is possible • Frequency independent • Load independent Combining extremely low losses with high audio quality, no com
Slide 11: Audio Quality
Audio Quality mMmPrS
Slide 12: Audio Quality
Audio Quality • What determines high audio quality? • Distortion • The “oof” feeling at high volumes • The human ear is incredibly sensitive to distortion • Distortion commonly caused by output inductors • MPS Axign’s feedback loop has tight control at all output levels • Low total harmonic distorti
Slide 13: Audio Quality
Audio Quality • MPS Axign technology creates extremely flat frequency response with minimal phase shift in the audio band • Independent on speaker load! • No smearing of the sound, instruments are distinct and precise
Slide 14: Cost-Effective Solutions
Cost-Effective Solutions mMmPrS
Slide 15: Cost-Effective Solutions
Cost-Effective Solutions • Heatsinkless • Proven in practice • Remove fans from enclosure • No constraint on inductor performance • Design freedom • Lower-cost inductors possible • Power stage agnostic • Cheap parts can be used (including motor drivers) • High dead time or low-performance power stag
Slide 16: Summary
Summary Design Objectives High Audio Quality Low High System Efficiency Cost With traditional amplifier solutions, audio designers are forced to choose two…
Slide 17: Summary
Summary Design Objectives High Audio Quality Low High System Efficiency Cost …but with post-filter feedback, audio designers can achieve all three!
Slide 18: Summary
Summary • High Audio Quality Design Objectives • Compensates for distortion introduced by the output filters • Load-independent flat frequency High response from DC to 40kHz Audio • THD+N < 0.005% Quality • Low System Cost Low • Eliminate heatsink High System • Low-cost, nonlinear inductors Efficien
Slide 19: Summary
Summary • Fully digital feedback loops have distinct advantages over analog feedback loops • Configurable • No component spread • MPS Axign technology is built on (patented) ADC and mixed-signal expertise • Enables the best audio feedback loops • Zero common-mode (ZCM) switching drastically reduces
Slide 20: Next Webinar
MPS Axign Class-D Technology Deep Dive Webinar: MPS Axign Class-D Technology Deep Dive me Tuesday, March 5th mrs Please join us for our upcoming webinar: MPS Axign Class-D Technology Deep Dive. Post-filter feedback in our solution is enabled by the low-latency analog-to-digital converter (ADC) and o
Slide 21: Q&A
Q&A mMmPrS
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